<template>
  <div>
    <!--面包屑导航 区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <el-row>
        <el-button type="primary" @click="showAddCatDialog">添加分类</el-button>
      </el-row>
      <!--表格-->
      <tree-table class="treeTable" border :show-index="true" index-text="#" :expand-type="false" :selection-type="false" :data="cateList" :columns="columns">
        <!--是否有效-->
        <template slot="isok" slot-scope="scope">
          <i style="color: lightgreen;" class="el-icon-success" v-if="scope.row.cat_deleted === false"></i>
          <i style="color: lightgreen;" class="el-icon-error" v-else></i>
        </template>
        <!--排序-->
        <template slot="order" slot-scope="scope">
          <el-tag size='mini' v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size='mini' v-else-if="scope.row.cat_level === 1" type="success">二级</el-tag>
          <el-tag size='mini' v-else type="warning">三级</el-tag>
        </template>
        <!--操作-->
        <template slot="opt" slot-scope="">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!--分页-->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3, 5, 15, 20]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <el-dialog @close="addCateDialogClosed" title="添加分类" :visible.sync="addCatDialogVisible" width="50%">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader clearable v-model="selectdKeys" :options="parentCateList" :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children', checkStrictly: true }" @change="parentCateChanged"></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCatDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 商品分类数据
      cateList: [],
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      }, {
        label: '是否有效',
        // 表示将当前列定义为模板列
        type: 'template',
        // 使用的模板名称
        template: 'isok'
      }, {
        label: '排序',
        type: 'template',
        template: 'order'
      }, {
        label: '操作',
        type: 'template',
        template: 'opt'
      }],
      // 控制添加对话框的显示和隐藏
      addCatDialogVisible: false,
      // 添加分类数据表单的对象
      addCateForm: {
        cat_name: '',
        // 父级分类 Id
        cat_pid: 0,
        // 分类等级，默认添加的是一级分类
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      // 父级分类的列表
      parentCateList: [],
      // 选中的父级分类的Id数组
      selectdKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize 改变
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听 pagenum 改变
    handleCurrentChange (newNum) {
      this.queryInfo.pagenum = newNum
      this.getCateList()
    },
    showAddCatDialog () {
      this.getParentCateList()
      this.addCatDialogVisible = true
    },
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取父级分类数据失败')
      // console.log(res.data)
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个函数
    parentCateChanged () {
      console.log(this.selectdKeys)
      if (this.selectdKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectdKeys[this.selectdKeys.length - 1]
        this.addCateForm.cat_level = this.selectdKeys.length
        return false
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮添加新的分类
    addCate () {
      console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败')
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCatDialogVisible = false
      })
    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectdKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable {
    margin-top: 15px;
}
.el-cascader {
    width: 100%;
}
</style>
